includes/libs/MWMessagePack.php

   1 <?php
   2 /**
   3  * MessagePack serializer
   4  *
   5  * MessagePack is a space-efficient binary data interchange format. This
   6  * class provides a pack() method that encodes native PHP values as MessagePack
   7  * binary strings. The implementation is derived from msgpack-php.
   8  *
   9  * Copyright (c) 2013 Ori Livneh <ori@wikimedia.org>
  10  * Copyright (c) 2011 OnlineCity <https://github.com/onlinecity/msgpack-php>.
  11  *
  12  * Permission is hereby granted, free of charge, to any person obtaining a copy
  13  * of this software and associated documentation files (the "Software"), to
  14  * deal in the Software without restriction, including without limitation the
  15  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  16  * sell copies of the Software, and to permit persons to whom the Software is
  17  * furnished to do so, subject to the following conditions:
  18  *
  19  * The above copyright notice and this permission notice shall be included in
  20  * all copies or substantial portions of the Software.
  21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  22  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  23  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  24  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  25  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  26  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  27  * IN THE SOFTWARE.
  28  *
  29  * @see <http://msgpack.org/>
  30  * @see <http://wiki.msgpack.org/display/MSGPACK/Format+specification>
  31  *
  32  * @since 1.23
  33  * @file
  34  */
  35 class MWMessagePack {
  36
  37         /** @var boolean|null Whether current system is bigendian. **/
  38         public static $bigendian;
  39
  40         /**
  41          * Encode a value using MessagePack
  42          *
  43          * This method supports null, boolean, integer, float, string and array
  44          * (both indexed and associative) types. Object serialization is not
  45          * supported.
  46          *
  47          * @param mixed $value
  48          * @return string
  49          */
  50         public static function pack( $value ) {
  51                 if ( self::$bigendian === null ) {
  52                         self::$bigendian = pack( 'S', 1 ) === pack( 'n', 1 );
  53                 }
  54
  55                 switch ( gettype( $value ) ) {
  56                 case 'NULL':
  57                         return "\xC0";
  58
  59                 case 'boolean':
  60                         return $value ? "\xC3" : "\xC2";
  61
  62                 case 'double':
  63                 case 'float':
  64                         return self::$bigendian
  65                                 ? "\xCB" . pack( 'd', $value )
  66                                 : "\xCB" . strrev( pack( 'd', $value ) );
  67
  68                 case 'string':
  69                         $length = strlen( $value );
  70                         if ( $length < 32 ) {
  71                                 return pack( 'Ca*', 0xA0 | $length, $value );
  72                         } elseif ( $length <= 0xFFFF ) {
  73                                 return pack( 'Cna*', 0xDA, $length, $value );
  74                         } elseif ( $length <= 0xFFFFFFFF ) {
  75                                 return pack( 'CNa*', 0xDB, $length, $value );
  76                         }
  77                         throw new LengthException( "String too long: $length (max: 4294967295)." );
  78
  79                 case 'integer':
  80                         if ( $value >= 0 ) {
  81                                 if ( $value <= 0x7F ) {
  82                                         // positive fixnum
  83                                         return chr( $value );
  84                                 }
  85                                 if ( $value <= 0xFF ) {
  86                                         // uint8
  87                                         return pack( 'CC', 0xCC, $value );
  88                                 }
  89                                 if ( $value <= 0xFFFF ) {
  90                                         // uint16
  91                                         return pack( 'Cn', 0xCD, $value );
  92                                 }
  93                                 if ( $value <= 0xFFFFFFFF ) {
  94                                         // uint32
  95                                         return pack( 'CN', 0xCE, $value );
  96                                 }
  97                                 if ( $value <= 0xFFFFFFFFFFFFFFFF ) {
  98                                         // uint64
  99                                         $hi = ( $value & 0xFFFFFFFF00000000 ) >> 32;
 100                                         $lo = $value & 0xFFFFFFFF;
 101                                         return self::$bigendian
 102                                                 ? pack( 'CNN', 0xCF, $lo, $hi )
 103                                                 : pack( 'CNN', 0xCF, $hi, $lo );
 104                                 }
 105                         } else {
 106                                 if ( $value >= -32 ) {
 107                                         // negative fixnum
 108                                         return pack( 'c', $value );
 109                                 }
 110                                 if ( $value >= -0x80 ) {
 111                                         // int8
 112                                         return pack( 'Cc', 0xD0, $value );
 113                                 }
 114                                 if ( $value >= -0x8000 ) {
 115                                         // int16
 116                                         $p = pack('s',$value);
 117                                         return self::$bigendian
 118                                                 ? pack( 'Ca2', 0xD1, $p )
 119                                                 : pack( 'Ca2', 0xD1, strrev( $p ) );
 120                                 }
 121                                 if ( $value >= -0x80000000 ) {
 122                                         // int32
 123                                         $p = pack( 'l', $value );
 124                                         return self::$bigendian
 125                                                 ? pack( 'Ca4', 0xD2, $p )
 126                                                 : pack( 'Ca4', 0xD2, strrev( $p ) );
 127                                 }
 128                                 if ( $value >= -0x8000000000000000 ) {
 129                                         // int64
 130                                         // pack() does not support 64-bit ints either so pack into two 32-bits
 131                                         $p1 = pack( 'l', $value & 0xFFFFFFFF );
 132                                         $p2 = pack( 'l', ( $value >> 32 ) & 0xFFFFFFFF );
 133                                         return self::$bigendian
 134                                                 ? pack( 'Ca4a4', 0xD3, $p1, $p2 )
 135                                                 : pack( 'Ca4a4', 0xD3, strrev( $p2 ), strrev( $p1 ) );
 136                                 }
 137                         }
 138                         throw new LengthException( 'Invalid integer: ' . $value );
 139
 140                 case 'array':
 141                         $associative = array_values( $value ) !== $value;
 142                         $length = count( $value );
 143                         $buffer = '';
 144
 145                         if ( $length > 0xFFFFFFFF ) {
 146                                 throw new LengthException( "Array too long: $length (max: 4294967295)." );
 147                         }
 148
 149                         if ( $associative ) {
 150                                 if ( $length < 16 ) {
 151                                         $buffer .= pack( 'C', 0x80 | $length );
 152                                 } elseif ( $length <= 0xFFFF ) {
 153                                         $buffer .= pack( 'Cn', 0xDE, $length );
 154                                 } else {
 155                                         $buffer .= pack( 'CN', 0xDF, $length );
 156                                 }
 157                                 foreach ( $value as $k => $v ) {
 158                                         $buffer .= self::pack( $k );
 159                                         $buffer .= self::pack( $v );
 160                                 }
 161                         } else {
 162                                 if ( $length < 16 ) {
 163                                         $buffer .= pack( 'C', 0x90 | $length );
 164                                 } elseif ( $length <= 0xFFFF ) {
 165                                         $buffer .= pack( 'Cn', 0xDC, $length );
 166                                 } else {
 167                                         $buffer .= pack( 'CN', 0xDD, $length );
 168                                 }
 169                                 foreach ( $value as $v ) {
 170                                         $buffer .= self::pack( $v );
 171                                 }
 172                         }
 173                         return $buffer;
 174
 175                 default:
 176                         throw new LengthException( 'Unsupported type: ' . gettype( $value ) );
 177                 }
 178         }
 179 }